Stove assembly



Od. 17, 1939. H A, SMH-H 2,176,382

STOVE ASSEMBLY Filed Feb. 18, 1957 Patented Oct. 17, 1939 UNITED STATESPATENT OFFICE STOVE ASSEMBLY Application February 18, 1937, Serial No.126,453

'I Claims.

An object of my invention is to provide a stove assembly of simple,durable and inexpensive construction.

A further object is to provide an electric stove assembly comprising topand bottom plates and a cylindrical wall interposed between them, together with means for retaining the plates assembled relative to eachother and a heating element assembled relative to the top plate.

A further object is to provide a seat in the top plate for a heatingelement, and a spider under the seat which cooperates with a. tie boltfor retaining the heating element in position relative to the top plate.d

Another object is to provide a stove assembly having top and bottomplates, a cylindrical wall and a spider all formed of relatively thinsheet metal but so cut and shaped that a very rigid and satisfactorycasing for a. heating element is provided.

Still another object is to provide a sheet metal spider forretaining aheating element in seated position relative to the top plate of a stoveassembly,such spider being formed with upstanding flanges outlining itscontour and ribs formed along the arms of the spider to preventundesired distortion of the spider when a tie bolt connection istightened.

Still a further object is to provide a bottom plate for a stove assemblyhaving a plurality of radiating, upstruck and downstruck ribs to preventdistortion thereof when a tie bolt is tightened, foot elements beingdepressed from the material of the base plate to support it spaced abovea supporting surface when the stove is in use.

Still a further object is to provide means of coaction between a bottomplate, a cylindrical wall, a top plate and a spider, whereby upon theparts being held assembled by a single tie bolt, there is suchinter-engagement between the parts that no other fastening means isnecessary.

With these and other objects in view, my invention consists in theconstruction, arrangement and combination of the various parts of mystove assembly, whereby the objects contemplated are attained, ashereinafter more fully set forth, pointed out in my claims, andillustrated in the accompanying drawing, in which:

Figure 1 is a plan view of a stove assembly embodying my invention.

Figure 2 is a. horizontal sectional view of the same taken below the topplate, heating element and retaining spider.

Figure 3 is a sectional view, the upper part of which is taken on theline 3-3 of Figure 1 and the lower part of which .is taken on the line3-3 of Figure 2.

Figure 4 is a perspective view of the terminal clip used in connectionwith my stove assembly.

Figure 5 is an enlarged sectional view on the 5 line 5-5 of Figure 3showing the terminal clip mounted in position; and

Figure 6 is an electro diagrammatical view of the heating element andcontrol means therefor.

On the accompanying drawing I have used the l0 reference character B toindicate a bottom plate,

C a peripheral wall and T a top plate. These plates are formed of sheetmetal and have the following characteristics.

The bottom plate B has adjacent each corner an l5 upstruck tongue I0 anda depressed foot element l2. The marginal edge of the plate B isslightly upturned as at II. At the center the bottom plate B isperforated as indicated at I4 to receive a tie bolt I6. A depressed bossI8 is provided at the 20 center surrounding the perforation I4.Radiating from the boss I8 are a plurality of upstruck ribs provided toprevent distortion or upward bending at the center of the plate B when anut 22 on the tie bolt I6 is tightened. The bottom plate- 25 B also hasdownwardly depressed ribs 24 which are slotted as indicated at 26 forair circulation.

The peripheral wall C may be of any desired4 shape. It is shown as beingsquare with rounded corners. It has an inturned lower flange 28 and 30an inturned upper flange 30 for reinforcing the side Walls againstundesired buckling or bowing. The corners of the wall C are indicated at32r The corners 32 receive the tongues I0 of the bottom plate B forpositioning the plate against lat 35 eral and/or rotary movementrelative to the wall C.

The top plate T has a peripheral ange 34 extending around the outside ofthe peripheral wall C. The ,plate T also has a smaller annular flange 36depending therefrom. This flange at three points has inturned ears 38for supporting a heating element H. Each ear 38 has a pair of side`flanges 40 with which the lower surface of the heating element Hcontacts, and an inner end flange 42 extending downwardly. At thecorner, formed between the flange 36 and each ear 38, I provide anangular rib 44 which serves to reinforce the ear and also space theperiphery of the heating element H from the flange 36.

The heating element H comprises a moulded plate I6 of porcelain or thelike having a suitable groove 48 formed therein. In the groove a coiledresistance wire 50 is located. The heating element 1-1 is retained inposition relative to the 55 top plate T by anut 52 on the tie bolt I8gaging a spider S.

The spider S has a plurality of arms 5I, the contour of which isoutlined by an upstanding flange 56 to reinforce the spider againstundesired bending when the nut 52 is tightened. It is additionallystrengthened by a central boss 58 and ribs 60 radiating therefrom alongthe arms 54. The end portions of the arms engage the flanges 42 as shownat the right of Figure 3, and these flanges are confined between theupstanding flange 56 where it passes around the end of the arm, thusinsuring proper positioning of the spider S relative to the top plate T.

A tongue 62 extends upwardly from the spider S and engages the bottom ofthe heating element H to prevent excessive tightening of the nut 52. Theflange 36 has a downward extension 64 which is of ribbed contour asshown in Figure 5. A terminal bracket 65 is secured thereto by spotwelding or a single rivet 58. The bracket 66 is prevented from turningrelative to the extension 64 by having a contour similar thereto so thatthe parts 64 and 66 inter-fit relative to each other.

A supply cord extends through an insulator 12 into the stove casing andis connected by suitable terminal bolts 14 with the heating elementleads 16, as shown in Figure 6.

The resistance wire 50 may be divided into two parts 50' and 50", whichare controlled by a pair of snap switches 18 and 80. When the switch 'Ilis closed, low heat is provided, when the switch 80 is closed, mediumheat is provided, and when both are closed, high heat is provided.

The parts B, C, T, H and S are all held assembled by the single tie boltI6. The parts are positioned relative to each other as alreadydescribed, and the projections 44 holding the heating element H spacedfrom the flange-36 permits atmospheric air circulation upwardly throughthe slots 26 and then around the periphery of the heating element toeffect proper heating of a kettle or the like placed on the stock.

The parts are inexpensively formed of thin sheet metal, yet are rigidlyheld assembled relative to each other by the single tie bolt and thepair of nuts 22 and 52 thereon. The time required for assembling theparts is very short.

Some changes may be made in theconstruction and arrangement of the partsof my device without departing from the real spirit and purpose of myinvention, and it is my intention to cover by my claims any modifiedforms of structure or use of mechanical equivalents which may bereasonably included within their scope.

I claim as my invention:

1. In a stove assembly, a top plate, a bottom plate, a peripheral wallinterposed between the top and bottom plates, a seat in said top platefor a heating element, a heating element seated therein, a retainingelement for said heating element engaging the bottom of said top plate,a retainer bolt through said heating element and retaining element, anut thereon to retain the heat- .ing element in said seat and saidretaining element engaging the bottom of said top plate, said boltextending through said bottom plate and a nut thereon for retaining saidbottom plate and peripheral wall assembled relative to said top plate.

2. In a stove assembly, a top plate, a bottom plate, a peripheral wallinterposed between the top and bottom plates, an open bottom seat insaid top plate for a heating element, a heating element comprising agrooved refractory plate seated therein and a resistance wire in thegroove thereof, a retaining element-for said refractory plate engagingthe bottom of said top plate and the refractory plate at spacedintervals thereon, a retainer bolt through said refractory plate' andretaining element, a nut thereon to retain the refractory plate andretaining element assembled relative to said top plate, said boltextending through said bottom plate and a second nut thereon forretaining said bottom plate and peripheral wall assambled relative tosaid top plate, said retaining element comprising a spider, a pluralityof means separated from each other directly supporting said refractoryplate for spacing the periphery of said refractory plate from theperiphery of said seat, said bottom plate having openings for permittingair circulation upwardly from beneath the bottom plate into, contactwith the bottom of said refractory plate and outwardly and upwardly incontact with the periphery of said refractory plate.

3. In a stove assembly, a top plate, a bottom plate, a peripheral wallinterposed between the top and bottom plates, a seat in said top platefor a heating element, a heating element seated therein including a`refractory plate, a retaining element lor said refractory plate engagingthe bottom of said top plate and the refractory plate at spacedintervals thereon, a retainer bolt through said refractory plate andretaining element, a nut thereon to retain the refractory plate andretaining element assembled relative to said top plate, said boltextending through said bottom plate and a second nut thereon forretaining said bottom plate and peripheral wall assembled relative tosaid top plate, said retaining element comprising a spider of sheetmetal having ribbed arms, said bottom plate being formed of sheet metaland having a plurality of radially extending ribs to prevent undesiredbuckling of the bottom plate when said nuts are tightened.

4. A stove assembly including a top plate having a cylindrical flangedepending therefrom, said flange having a plurality of inturnedsupporting ears, a. heating element resting on said ears, a spiderhaving arms engaging the bottom surfaces of said ears and a tie boltconnection between said heating element and said spider, said top platehaving a plurality of projections extending angular-ly from'said flangeto said inturned supporting ears for spacing the periphery and thebottom of said heating element from said flange and ears.

5. A stove assembly including a top plate having a cylindrical flangedepending therefrom, a portion of said flange having an extension ofribbed cross section, a terminal support having a connecting portionengaged with said extension and having a contour similar thereto and asingle connection between said extension and said connecting portion,said flange having a plurality of inturned supporting ears, a heatingelement resting on said ears, a spider having arms engaging the bottomsurfaces of said ears and a tie bolt connection between said heatingelement and said spider.

6. A stove assembly including a bottom plate, a peripheral wall, a topplate provided with a Ventilating opening and al heating element, a tiebolt connection between said heating element and said bottom plate, saidbottom plate having a plurality of ribs radiating from the point ofconnectionof the tie bolt thereto, some of said ribs being depresseddownwardly from said bottom 7| plate and some being depressed upwardlytherefrom, said downwardly depressed ribs having elongated ventilatingopenings formed therein longitudinally thereof adapted to admitVentilating air upwardly through said stove assembly.

'1. In a stove assembly, a top plate having a peripheral downturnedange, a bottom plate, a peripheral wall interposed between said top andbottom plates and confined at its upper marginal edge within saiddownturned flange, a heating element supported by said top plate, thelower edge of said peripheral Wall having an inturned ange, said bottomplate having a plurality of downwardly dished portions to serve assupporting feet and elevating means for the bottom plate and having itsmarginal edge slightly upturned and engaging the bottom surface of suchinturned flange, upstruck projections from said bottom plate and spacedinwardly from said marginal edge, said upstruck projections engaging theinner edges of said inturned ange to position said bottom platehorizontally relative to said peripheral wall, and tie means connectingsaid top and bottom plates together, said tie means retaining said topplate in engagement with the top of said peripheral wall and retainingsaid marginal edge of said bottom plate in engagement with said inturnedange of said peripheral wall.

- HOWARD A. SMITH.

